Russia warns UK against 'punitive' measures

The UK's threat of "punitive" measures against Russia over the poisoning of a former spy and his daughter will "meet with a response", Russia has said. Russia's UK embassy posted a series of tweets as a deadline looms for it to explain how a Russian-made nerve agent was used in Salisbury. It said there would be no reply to the "ultimatum" until it was given access to samples of the substance.
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